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Electrocochleography, MLR, P300 and Cortical Responses, Evoked Auditory Potentials Part 2

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1.  When using common mode rejection the voltage difference is measured for the Active electrode Reference electrode Active and Reference electrode Ground electrode

2.  What is the purpose of ECochG? to obtain hearing thresholds in a difficult to test population (i.e. infants) to determine if the patient may have an issue in the inner ear, i.e. endolymphatic hydrops or vestibular hydrops to determine the cause an auditory processing issue all of the above

3.  In Electrocochleography, why would you obtain a larger response using TMtrode versus tiptrode? Ability to get better impedance TMtrode is closer to the neural generator Patient is more relaxed with TMtrode and therefore the noise floor is lower None of the Above

4.  In Electrocochleography, what measurement do you look at to determine whether there is an abnormality in the response? The AP latency The cochlear microphonic frequency The SP/AP ratio None of the Above

5.  In a normal ear for MLR, what happens to the latency of the response as you decrease intensity? Wave V latency increases Wave V latency decreases Nothing, it stays close to the same None of the Above

6.  For middle, late and cortical responses, what should the patient state be to obtain the best response? Asleep Awake Sedated None of the above

7.  For P300 how many types of stimuli are presented? One toneburst either 1000 or 2000 Hz One click Two - a 1000 Hz toneburst and a 2000 Hz toneburst None of the Above

8.  Which of the following may cause an abnormal result on P300 testing? dementia certain neurological diseases certain psychiatric diseases that cause a disorder of cognitive functioning all of the above

9.  If the rare and frequent stimuli are hard to discriminate, what happens to the P300 response? It decreases in amplitude The latency shifts to the left The latency is variable between runs None of the Above

10.  The cortical response is not fully mature until what age? 5 years old 30 years old Late teens 75 years old